@josé_5163,
Pardon the long post, but your question is a good one; including the parts you may not be asking specifically!
I have no inside information, but I think that is a "yes." I was unsuccessful in getting the project I was testing to open in anything other than the Beta.
I have posted about how to minimize problems when updating the Beta: https://community.adobe.com/t5/premiere-pro-beta-discussions/new-beta-uninstall-reset-or-just-update/m-p/15577497#M12541
That post assumed you were updating, but does not address whether and when to update. See my "Cautions" when using the Beta here: https://community.adobe.com/t5/premiere-pro-beta-bugs/cannot-install-premiere-pro-beta/idc-p/14848390#M3790
You have no choice but to use the Beta currently, and many users do so regularly with deadline projects.
I would add the following to what I have posted:
Be certain that you have auto-update turned OFF. In the Creative Cloud Desktop, click on your avatar/account -> Preferences -> Apps. You'll see Auto-update.
When there is a new build of the Beta, an invitation to update appears. Do NOT click on it. As noted in my "Cautions," stop-your-work-dead-in-its-tracks bugs may occur in any build of the Beta. While they are often fixed before many users realize they are there, they may persist for multiple days. And once you update the Beta, you cannot go back.
So stick with a known-good Beta build as much as you can. As I noted in the update practices post, I use a clone of my system drive as a backup to roll-back to a previous version. Currently, through the cloud desktop, you only have the choice of the final build of Beta 25.6 or the latest build of 26.x. So the only way to roll-back to your known-good build is a clone.
I'm just glad the Beta is a working option for the current issues. And it has been working well for me lately.
Stan
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